When 16-year-old Britney Ujlaky disappears, a small town in Nevada bands together to track down a potential suspect - an unknown cowboy; Soon, their focus turns to someone much closer to Britney.

When young mother and paramedic Annamarie Cochrane Rintala is found dead at the bottom of her basement stairs, it takes four trials and 13 years before justice is served. In Friday's Dateline, insiders close to the investigation speak out in new interviews about the final verdict.

INTERVIEWS WITH: Prosecutor Steve Gagne, defense attorneys Rosemary Scapicchio and Chauncey Wood, and others.